SpringBoot构建微服务实战

整体架构:

 

服务提供方实现:

1. 创建一个Maven项目,

目录结构:

pom.xml文件内容如下:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.windy.mall.product</groupId>
    <artifactId>ms-mall</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.0.RELEASE</version>
    </parent>

    <name>ms-mall</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-x-discovery-server</artifactId>
            <version>2.11.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
    </dependencies>
</project>

2. 创建数据库,sql如下:

create database db_products default charset utf8;

create table products (pid int not null primary key auto_increment, pname varchar(200), type varchar(50), price double, createTime timestamp)

3. 创建resouces folder: src/main/resources,并创建application.properties文件

spring.datasource.url=jdbc:mysql:///db_products?useSSL=false
spring.datasource.username=***
spring.datasource.password=***

4. 创建实体类package: bean,并创建实体类Product.java

package com.windy.mall.product.bean;

import java.sql.Timestamp;

public class Product {

    private Integer pid;
    private String pname;
    private String type;
    private Double price;
    private Timestamp createTime;
    
    public Integer getPid() {
        return pid;
    }
    public void setPid(Integer pid) {
        this.pid = pid;
    }
    public String getPname() {
        return pname;
    }
    public void setPname(String pname) {
        this.pname = pname;
    }
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public Double getPrice() {
        return price;
    }
    public void setPrice(Double price) {
        this.price = price;
    }
    public Timestamp getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Timestamp createTime) {
        this.createTime = createTime;
    }

    public String toString() {
        return "Product [pid=" + pid + ", pname=" + pname + ", type=" + type + ", price=" + price + ", createTime="
                + createTime + "]";
    }
    
    
}

5. 创建Mapper package:mapper,并创建一个Mapper接口:ProductMapper(整合Mybatis,基于注解的形式)

Mybatis会帮助我们自动创建实现类, 我们只需要声明接口即可.

问题: 如何使用Mybatis的逆向工程,自动生成实体类,并且Mapper接口都是以注解的形式存在,而并非XML形式?

可以考虑先使用Mybatis的逆向工程,生成实体类和Mapper的XML文件,然后再根据需要转换使用基于注解的方式.

package com.windy.mall.product.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.windy.mall.product.bean.Product;

@Mapper
public interface ProductMapper {

    @Insert("insert into products(pname,type,price)values(#{pname},#{type},#{price})")
    public Integer add(Product product);
    
    @Delete("delete from products where pid=#{arg1}")
    public Integer deleteById(Integer id);
    
    @Update("update products set pname=#{pname},type=#{type},price=#{price} where pid=#{pid} ")
    public Integer update(Integer id);
    
    @Select("select * from products where pid=#{arg1}")
    public Product getById(Integer id);
    
    @Select("select * from products order by pid desc")
    public List<Product> queryByLists();
    
}

6. 创建一个响应类Response,把所有返回结果信息,封装在这个类中.

package com.windy.mall.product.utils;

public class Response {
    /*
     * code: 标志状态码
     * 200:表示成功
     * 404: 表示资源不存在
     * 500:表示失败
     */
    
    private String code;
    private String msg;
    private Object data;
    
    public Response() {
        super();
    }
    
    public Response(String code, String msg) {
        super();
        this.code = code;
        this.msg = msg;
    }
    
    public Response(String code, String msg, Object data) {
        super();
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
    
    public String getCode() {
        return code;
    }
    
    public void setCode(String code) {
        this.code = code;
    }
    
    public String getMsg() {
        return msg;
    }
    
    public void setMsg(String msg) {
        this.msg = msg;
    }
    
    public Object getData() {
        return data;
    }
    
    public void setData(Object data) {
        this.data = data;
    }
    
}

7. 创建Controller类(由于只是简单的Demo,所以没有实现Service层)

package com.windy.mall.product.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RestController;

import com.windy.mall.product.bean.Product;
import com.windy.mall.product.mapper.ProductMapper;
import com.windy.mall.product.utils.Response;

@RestController
public class ProductController {

    @Autowired
    private ProductMapper productMapper;
    
    @PostMapping("/ms/product/add")
    public Object add(Product product){
        Integer res = productMapper.add(product);
        if(res == null){
            return new Response("200", "Success!");
        }
        
            return new Response("500","Fail!");
    }
    
    @PutMapping("/ms/product/update")
    public Object update(Product product ){
        return new Response("200", "Success!", productMapper.update(product));
    }
    
    @GetMapping("/ms/product/{id}")
    public Object get(@PathVariable("id") Integer id ){
        return new Response("200", "Success!", productMapper.getById(id));
    }
    
    @GetMapping("/ms/products")
    public Object list(){
        return new Response("200","Success!", productMapper.queryByLists());
    }
    
    @DeleteMapping("/ms/product/{id}")
    public Object delete(@PathVariable("id") Integer id ){
        Integer res = productMapper.deleteById(id);
        return res==1? new Response("200","Success!") : new Response("500", "Fail!");
        
    }
    
}

8. 针对Mapper的单元测试(待补充)

9. 编写服务注册类ServiceRegister.java

调用方:

1. 创建一个新的Maven工程,pom.xml文件如下:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.windy.mall.web</groupId>
    <artifactId>ms-mall-web</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>ms-mall-web</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-x-discovery</artifactId>
            <version>2.11.0</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.3.2.RELEASE</version>
        </dependency>
    </dependencies>
</project>

2.